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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8558d6e27783d9c6bc2efb206636eeb5716c31732887fc6e5f363fb84071d896' 
  AND token = 'y4USYfJU7ALOKIzMaEQbi5U6LYycvJrbTjgbnOt9W0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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