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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3743243313ab1e5a5f6667f9b897d9b88071e788d4a18f03d801ae373047b6b7' 
  AND token = '2DCnc6LLDChAwDCKkr0VU88+2BL0WdU3pB+FhRy2XBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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