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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b62db3a8845f99575af3c26f1159ddec23d32783de0755bdf3caea7ca1dc7dc' 
  AND token = 'jH/tTSMy1x9Sb/Ywso5tvBQydCBoGhM0gPBkB1jKIbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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