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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c21323eb0ee59bd0810de780faa15184068a51e9e677676934076d8a29e5a07' 
  AND token = '6NL/kfMCOLuSxBKMgG5D9mcmC79y5Eolqcld9XkaEg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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