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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d441b660b8d1edbbc80fec356186ce6e89495f3ba547ca3d53c6edb504cb29' 
  AND token = 'qyUMx8V2DNElLLrounIZm+Jl/4sI0XL7b8DpiFlXtxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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