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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e41fc4e55dc2d9c5f8ba3b37fdde8eb00eda8a881f47a6173c26f9fdb83193' 
  AND token = 'v3dMIBj5ubzszChhjoach30C4K2xwnJd4Sufq78hfyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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