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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6b88f8b2ae909948c640cd61a87927605e8a1c850ff1c45a1a1eaa8a9a7cb2' 
  AND token = 'MUSEGbm6y7ZX6JuJ+ZlxenqLKvFLMraPOTbDJf809tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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