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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f406e9d829700fdc7525e8754ee97b10f3c84d1ab668622b6694e5338707ecc' 
  AND token = 'gNRZZ8dRNqLu6J7O0cig0WZeWNn5gQKP7fb+BRZfLZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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