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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf8ec7ac8d8fe9ddb408a74275ac186586ca8cdefa9f74940e328bd74068083' 
  AND token = 'OLqZGTGecwS2woJjzq8Mci1RfPpWDJuB3zn37v6oepY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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