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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807912e4dca54018303a4fb5a3d7042eb41f3a48f73a68445cea81a86d5db814' 
  AND token = 'QjZ00RWGCPON0dXdPR8wSsGJgi4v1aTFEaFXZhUI7yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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