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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6735843d053ea863e586593e5fc52edf576f86ef1f56634ca04d451e7fce799e' 
  AND token = '/4z2r9GeFT1YMTOqQENVyZxQa1sJq7BjsMA13PHkqo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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