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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9468d2ed050dba7aa5bf76d513100b8c911e5d80ba321286e8f5d1f7592dc442' 
  AND token = '4GDSHHCHs8tEpFmotoyWbx6IQHPAyVJz8KWd3vVM7is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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