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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ae64790645eeb160167b3c1f75a59d01f700bd1491df7e96d8d7323088f1d5' 
  AND token = 'Mgg9H/mugdfFnpoXoZ/MTE24d0bcsrqhefv8Om8YjPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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