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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06e55f28c414beeeecc2a926fcfac1c244f19590d4f84670c5355808209dad7' 
  AND token = 'q1ReEFOG3nypc3h1n/Vt0ZRlA1sZkNl723L+89x3bco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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