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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff9044170e68a005e310a08713f4e4f5a2a2887d0660348cddc427c7862134f' 
  AND token = 'afw71gknRRcWFAiyQaJp1GLYTvGDPpoNZcl0etSDKtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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