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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184e75a45a08c6a42efe3e8a8c2b4fcba03b28b1ce6630816385c57b174c705c' 
  AND token = 'Q+N9Ut36TvP2IB1Mg2RYh/iLO62xC/4WIkQBBkjv6Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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