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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84cd6665cfdb611a4bd931acea197e4fc841d8d96d38137fe404a55bb5e24dfb' 
  AND token = 'Zv+77LujgW7AXwbbCcGJsDfcpTSBRfoN2F68MmrwD2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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