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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72f8985d8ed1f418c0fd3e32d1edd9dc5bf3c4586957cbc9b4d43a161c5c870' 
  AND token = 'nbTF6jmG2G9j0ADXjMtGIo7vQbtP3v0zJlARgCoKRpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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