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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33153cc71a27ce7d49993bb98596e6f582aa55cef91c58cc81c3503f6bd7ac2d' 
  AND token = '/17iKNsQsjnu+sBZWN3/jqU0/Zy7XBNfh9s+fls4Eh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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