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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d39bda8af239e7157ad6333dd48d8aa3ddb1fdcb13e28d3d41e1291297974f' 
  AND token = '+5BVpBi+Vunkby5PboysQSXUj6LC+p33iDhiXa/L3P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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