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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb81fc5553b3574086b0a7870dd5cf7fc75445df9a69069b6c62873cac07e37' 
  AND token = 'KCrwsqB60z64LfAPGyB8CMz15KBPX7oXyqcrOZcN/bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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