SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a058d837d0228c8d84ef9eb986ba05bbb646830ac3a37f78d731c7586576027' 
  AND token = 'e77m+Zh52UvnqWS3TgvFUVU7om1cCJgg2Q/PlwL6/BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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