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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bcef017640ead0eb3de9c2d1616f67434e4f4a4e35f6d1fb546ca3c8d4fdf8' 
  AND token = '7FfPMn9TqKq/0M/5x01YNUr/ECYs690lkzuZTqnZquE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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