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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6b6095e4e4ec4ef6459e65cd2742078851563af58a12ce14fa5fbbcdb8e559' 
  AND token = 'II62onkIhMMmBlbk+1opR575GX2WN+48NIYSqBKzW54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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