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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6f8e08d5b7de605083cabae24d171514aa29edb23bda4d11fb042ac69d39c3' 
  AND token = 'ror26TD4QeA79Y1PWfJOASc7KP26l9cyb3Vp1uEVC58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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