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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e3e063c43ed7fa1ba3849534a5e1c69452e2d7a24efff24b1fafe0df94d936' 
  AND token = 'RkUUJQ8MBCHM9B13whJldbqfLfrdagCLCXTpM6k92o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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