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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30a09916ab834f26077e53589c2dc85377c1dec55204a71eefaec6374b94ca5' 
  AND token = '5UACMcMNFHGUzeBtgmx7l4vm/5wKkWursyJMLZZiOdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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