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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '587b4d3e598fd2776f0320a0decd45dee6ce5eefc165409fee7a8d7d2b22799e' 
  AND token = 'sJ3gt5f70AFwQmqXo9b7+9++sGEOjqI/jotiUPdS6sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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