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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b782e3ae634687f44b653b8be6f0a389a4d8a297e168673e6942b4d36ed026' 
  AND token = 'pnUimVET6cJ5RQYB8Vtx1asS9O3JoFCm86BnN0WTkiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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