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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24229978a32d0c709fe572b4b233361a5ff1870ac424f80ed01e58a506ad2a6' 
  AND token = 'p0QquCSI1lOB2SwBj3TfR4ySDwVg7owJbrWrkGyrRwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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