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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5384fca962dd93c511fca0e526c06bbf6c6289d2b8af74bb6e485dbdc423bad2' 
  AND token = 'gQYeGcP0vLBhfKd7j6LygpADijo6rp9Ct05eRwA7fYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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