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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402a141d91fd6009c354c2df187943f10f6de24de404a0bb7fe7eb3d080bd175' 
  AND token = 'DmFuYqM68e7vlhEhVwqbH1V5UV39XLTz9FPTiPJw2Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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