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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b08810ee27debb395beba6e4ca5c080dea2c0a4ef72ad9ac7a2c979fdc6e6ff' 
  AND token = 'RNSBHh5jHNp6FTYgwLPeBpxLOEjiNT467hr7oxxtNKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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