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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23c8630ff2b9a46e1c0d8d2eb7d20f24d9ea84da398bef07134ebe9573b6975' 
  AND token = 'rOL4anPuOgzGTa6uepMvC1qqOjfJzltXOsWWQP7l6/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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