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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8377e4fbfdbb4f970a74805eb28be4c3bc4e9515f4e48d2de3cb00a1d12fed2' 
  AND token = 'BsfgeIwtJADoRZ3QDQXk8mgXPfuDIS3uKtaKTzQREKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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