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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7c238b3800701e9b8e0283e526142b58f4b3cb83c4847d4ca7a55052652873' 
  AND token = 'UEh3kPgD4KSY2sO1nTFZm0JCI7qyxmK28E5KA51Bllw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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