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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7597b65adf4e090fa8ed4bf86f789fda7cfde8198d15b320f1700a5e5b5a7fe1' 
  AND token = 'PZvfZBKbvP9fjALXrjKJzAi8UDwufVUSwCuA8D2RuLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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