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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc7f838582d08336c1218937c520584aadcf3ce814a8e04ba489932da4ddb40' 
  AND token = '7SAQ55fL9+CkLWw+x4AaPWD6/XQaCCwTTLgXEmACj48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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