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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2cd82d405d4d8dc9ec1b9fe908e64ac6684cdec678d6d281eee60d848eeaa39' 
  AND token = 'dMbv0FPkJew1vHzYnR4VVYUWJZoHb8rsJ7nJmSk43BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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