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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d197b6bf345e06d8119d05cf6d9b5168ee861ad79deccd2dc6795e010716667' 
  AND token = 'WukXkCIfOMMyAgJ+YEwKPTs6sHoXoHnPtAgdXkuDetA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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