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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4df7013ed7bb2c9de50712a00846c1691b84236a5a18c4f9d2ab0748e58737' 
  AND token = 'uyYIY3S/A87oeYCGfb3XAyCgEdtWD4/c/EVRrbAvVbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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