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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6683dd73efa09d4eebea48d68983998e5ba66a39751d3a8f5dd2c0d9f823e9a2' 
  AND token = '6f6IDteX1o/Gm8d+8ZxROZakUGv4OOzHKfBNT0UV8vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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