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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf04e446187ccdc60ab9b5f6dafc52bca179395d69f6dc9b00b19a000e2f30c1' 
  AND token = '5OOLF+FKZS89LMnk+McO/LZk+435NJaCIe0dv3H+Lr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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