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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b92f60680304335c64b3f0c45e0f1856aa17bc9df0d4c6d53b219ec4a837c3' 
  AND token = 'nLPgBPrHLL4tWD8i3kIdDKN7TQugmSuuMg8jEF9EGQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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