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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac334bf493e5dabaf2e8976ee6238cc5feae9a4908cabc00bdc52170ee6a060f' 
  AND token = 'wMCTgOy//yRi+ituFe8cu28NvmWRnpdWXFHYJA/jQoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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