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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f2b97bb3cc467728e5d6ad25e483b5312a07f82372b9576055dfee33321fcf' 
  AND token = 'xV6u3nhGcChq0BRHNPC1h7Lf24Bm3yZQbg0L9tvnOe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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