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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d06a884a3cee22daade9fcafdb1d5d30d834f2c2c5d5aacbab222a576b8891' 
  AND token = 'rW0T9jwowWD3D36Hh2yIAmruY4KpWv1d8tqrOrYaaNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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