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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2765aea1e2e468aa8efafbcb38c691fa8abc2a17df4b45d3af1070a35ad0c6' 
  AND token = 'Un8kpxe4mA+1sie57gdMDOkLGkQhvF966AfqLDc2j2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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