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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '525e07cbbad858f83281a35d08ffd9f576bff3033e4917654f7d6a62ed4e9131' 
  AND token = 'v1kDDqK77beUaAj57KBB93aWkhwmfGbc1LWLxwkcfQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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