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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675d7b5ca1cb05d47f24423431f0911755f27b5effd041c2b5930f13ec7c3b29' 
  AND token = '7VyZRvvwnS8KHF9TI6/9tsW8tBk9uWJeOGAll5ONk9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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