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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2067de42b7aca3e29f6bb85e72a44eaa557d297d64231a73ab1fea8e8a8b593d' 
  AND token = 'KGgmCaMUCjKK2uFXKF/cQLQXcpia1NR66lzqva9Z+7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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