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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641fbc4d042329c06c6c7899798d6f70e4c6e0494566f661f294933e4091ad92' 
  AND token = 'xaJ2YthoXMQeE94LC/5Xd97LW3o2WDqYZedFn1pFsOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00129

JSON explain

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