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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7796e9dcf2e62f06bf2265f7aa4709f63162e651819e08e3446e3665eff1f3d' 
  AND token = 'EjeLw/3Kiqdp2YKoh0jMl7AntSFpgMFJh5ylidbBIgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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