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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9f4c0d9e4f444c68d2ed663b5a923bc046cf32036d847ff5d336968c6b5d9e' 
  AND token = 'TFQaRMjYhruaGljTV6XbWK4c8SxrUd/hHik0A7+pI50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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