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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9b23b09607ef90cd514574b642b6e54a66cd49697743f5026d55e3fcb59b12' 
  AND token = '0ioGjmhAbmwvQVIRU8ZOHlcAl6pHAhfAGKVt6ioTKHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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