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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe1d258cc5cc42205c76b15420ca16bc591f423cbe913a5bfef4b4dcc5e0870' 
  AND token = 'A1KsuHXQLDxbkwCny7d7R6DYGtxWbrK1KVw7k4Az8EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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