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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b45a489f6a83a0369704d93183a7fa2b8d7a77861578b9591481a9040f62e1e' 
  AND token = '6tAfTbP2fTbkC2eZP0R19ufIZQnyY7CkImgSAmzvE6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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