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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf213501ee9cf5ec554473a15edac449a67de2ea687f363f72acfc0a6e2bbf5f' 
  AND token = 'uosU8cYW9rnDQJacHOKdCYO3N1h/ixRj+qubnCgfd+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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