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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff694f08a609f8ab313f9c75e0e0987c8216c55d5824a286ee696a6af324292' 
  AND token = 'UfegjqjqbG2ClPxoP8ryRI9Kgh8IO4lZfZbC5ZV3M5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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