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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8bda765d6e603d8bf17bfa4416b4055b7e5f0e7bc0571f9e84999cd426a246' 
  AND token = '9A338m3uBYM+KsLIKy7/xpSKp1SBBSDGQ6A7WykMsBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}