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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0a49c77a9ab11f275fe460c76cbfc9f4da5a890fb7cb54c9a6bd9df46cc8ff' 
  AND token = 'u36t9UpGjeslyfPP/AMEdBO5rfsWzhJ748t7ypSPwWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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