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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9accba5cfcec13f880ecc6500110c361c049fb1257f8eec5c599a26053f06f8' 
  AND token = 'we1WWFmCyLcvX6rrkxuzrgbedbWSsEzEtGTAg6Z73A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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