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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a10a2637f517faa9b00d03cb428ce756e867a9ec4f59198db825330733db5f9' 
  AND token = '7LrTS5UU/V03gXG9bvRHP7zDNGg0ME+eU9VKrSQg/uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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